diff --git a/Ch2 - Basics/challenge_solution.py b/Ch2 - Basics/challenge_solution.py
index e34cdcf..caeb9dc 100644
--- a/Ch2 - Basics/challenge_solution.py	
+++ b/Ch2 - Basics/challenge_solution.py	
@@ -3,7 +3,18 @@
 #
 
 def is_palindrome(teststr):
-    # use the slice trick to reverse the string
+    # one way to do it: calculate the reverse of the string
+    # reversestr = ""
+    # strindx = len(teststr)-1
+    # while (strindx >= 0):
+    #     reversestr += teststr[strindx]
+    #     strindx -= 1
+
+    # if teststr == reversestr:
+    #     return True
+    # return False
+
+    # more advanced: use the slice trick to reverse the string
     if teststr == teststr[::-1]:
         return True
     return False